<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>函数参数默认值</title>
</head>

<body>
    <script>
        //ES6 允许给函数参数赋值初始值
        //1.形参初始值,一般位置要靠后(潜规则)
        function add(a, b, c = 20) {
            return a + b + c;
        }
        let result = add(1, 2, 3);
        console.log(result);

        //2 与解构赋值结合
        function connect({host,username,passwoed,port}){

            console.log(host)
        }

        connect({
           host :'localhost',
           username:'root',
           passwoed:'root' ,
           portL:3306
        })
    </script>

</body>

</html>